Leakage of mantle helium from the Liaodong Peninsula, China

The isotopic cumpositions of helium have been investigated in hot spring gases sampled from the Liaodong Peninsula. China. The³He/⁴He ratios range from 0.14 Ra (0.14 times the atmospheric³He/⁴He ratio of 1.40 × 10^-6 to 0.72 Ra.³He/⁴He versus⁴He/²⁰Ne ratios and He contents suggest that a small amount of mantle-derived helium reaches the earth’s surface. Helium iwtope ratios of the hot spring gases show a distribution pattern similar to the regional heat flow values, indicating that the positive thermal anomaly occurring in the rtrea is closely associated with the presence of mantle-derived helium. The observations described above provide some significant evidence that the molten magma originating from partial melting of the upper mantle may have intruded into the continental crust along the activity fault. The coupling of the presence of mantle He and heat flow anomalies to seismic activity in studied region seem to imply that there is an internal relationship between mantle degassing and seismic activity.     

Properties of a supercritical superdiffusion and solutions of its corresponding differential equation

The range and the nonextinction property of a supercritical superdiffusion and solutions of its corresponding differential equation are studied. It is pruved that under a suitable condition, the conditioned superprocess of the supercritical superdiffusion is a subcritical superdiffusion.     

Cloning, construction of prokaryotic expression vector and expression ofEscherichia coli cytosine deaminase gene

Cytosine deaminase gene ofEscherichia coli strain H-30 was cloned, and its initiation codon of ‘GTG’ was mutated to ‘ATG’ by PCR. Prokaryotic recombinant expression vector pBV220-CD was constructed. Clone with high enzyme activity were selected by detecting their specific activity of cytosine deaminase. 5-FC(5-FC, 5-fluorocytosine) could induce the lethal toxicity to cells containing active CD gene. DNA sequence analysis indicated that there were 16 altered bases and 5 of them resulted in the alteration of amino acids in predicted peptide by comparing DNA sequence of the clone H-30-CD-11 with high enzyme activity with CD gene reported in Gene Bank.     

镰游仆虫Euplotes harpa无性分裂时期形态发生的研究

在显微和亚显微水平上,研究了镰游仆虫Ｅ．ｈａｒｐａ的形态结构及其在无性分裂时期的形态发生。对无性分裂期间各种纤毛器原基的起源和发育作了详细的观察和描述,着重注意了各种纤毛器原基的相互关系和发生的顺序性。同时,对基体在皮层上的“移动”及基体与“基体托架”的关系也作了研究和分析。     

基于分形理论的制造决策映射模型建模

运用分形理论的基本原理,分析了制造决策映射模型及其建模中的分形特征,提出一种分形的决策映射模型建模原理。     

分形理论在制造决策模型实验数据建模中的应用

运用分形理论的基本原理,研究了制造决策映射模型实验数据建模中的模型分维,并将基于分形的决策映射模型建模原理应用于断续切削加工过程决策映射模型的实验数据建模和分析。     

日中机器翻译中的可保留歧义关系

着重阐述了日中机器翻译中可保留歧义关系（ＲＳＡ）这一新概念及其处 理手法．所谓可保留歧义关系是指即使不消除原输入文中授受构造上的歧义 性也能生成反映原文意思的译文关系．具体而言,就是研究由并列助词［］、 连体助词［の］和名词构成的名词短语及由用言连体形构成的句子中授受构 造上的可保留歧义性;并在此基础上提出了一个新的翻译方法．从技术论文 的２ ９１９个句子中抽出了含有上述可保留歧义关系类型的句子８０６个进行了 翻译实验,正确率为９７．７％．从而确认了所提方法的有效性．     

角膜保存方法综述

本世纪30年代,Filatov成功地保存了尸体角膜.60年代后,角膜保存得到了广泛的重视和研究,并先后发展出十余种保存方法,其中一些方法得到了推广和应用.本文全面报道了这些方法,并给予简短的评述.     

小麦流态化干燥实验关联式及在热泵流化床谷物干燥中的应用

基于流化床干燥理论,采用热风循环充分的电热烘箱作为干燥器,对小麦进行了一系列的薄层干燥实验研究,模拟小麦流态化干燥过程,总结出适用于流化床小麦干燥时间预测的经验回归公式.开发了热泵流化床谷物干燥实验系统,并将小麦干燥的经验回归公式应用于此实验台的干燥实验过程.结果表明,小麦干燥经验回归式可用于预测小麦在流态化条件下的干燥时间,所开发的热泵流化床谷物干燥装置经济性合理,有市场应用前景.